When call guardian is disabled on bt8610 it seems to disable CLI (caller display) permanently in the exchange. The customer care and technical team believe Caller display is enabled but it is still disabled on the line. They are now to send an engineer to check from our end - a lot of hassle :-(.

There seems to be some interaction between the device and the exchange which causes a permanent change in the line configuration i.e even when another device (non guardian) is connected to the line.

I wouldnt advise anyone to buy a guardian phone if the caller blocking function is not required.